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Armstrong air ultra V furnace. 3 led flashes and no heat.

Customer Question
Hello, Armstrong air ultra V...
Hello, Armstrong air ultra V furnace. 3 led flashes and no heat. Pilot won't light. Can you help?
Submitted: 2 years ago.Category: HVAC
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Answered in 11 hours by:
1/30/2016
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago
gotoman for ac
gotoman for ac, HVAC Technician
Category: HVAC
Satisfied Customers: 5,357
Experience: 51 years of experience install design and repair of all makes and models of AC
Verified

This is a pressure switch lockout. Looking at front of furnace you see the small motor. Kill power to furnace and turn it back on. This will clear faults. See if small fan motor runs or tries to run. Put your hand on it to see if it is trying to run. If fan runs clean the small hose fittings. The small hose that attaches and runs to switch upper right. Remove hose and clean small firings with paper clip. Also check to see if the vent pipe is blocked by snow or ice. Try this and let me know. Russ

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Customer reply replied 2 years ago
Hi Russ. I tried all that last night. The small fan motor doesn't even try to run so I'm not sure if that's the issue.
Customer reply replied 2 years ago
The hoses and fittings are clear and the vent pipe is clear. Being the fan doesn't kick on I feel like that could be the issue
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

If you are comfortable with electricity unlug fan from connector and put 110 volts directly to fan. If fan runs motor is good. You have a smart valve for gas valve and there is a board in the blower compartment that gives the codes. It going to be fan motor or board. Russ

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Customer reply replied 2 years ago
Ok thanks
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

Sequence of operation fan runs for about 15 seconds,ignitor comes on for a few seconds and gas valve energizes and flame is proven thru flame sensor. Russ

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